What Causes Sudden Slurred Speech, Inability To Move Extremities And Blurred Vision?
I would wait.
Detailed Answer:
I read your question carefully and I understand your concern.
TIAs can be easy to diagnose when they are typical, but often they are tricky as symptoms do not correspond to a typical vascular territory and might not represent a TIA. Yours is one of those cases as the symptoms you describe are somewhat too diffuse to be explained by temporary interruption of blood supply in a single area, as you mention speech, limbs on both sides and vision. A TIA of the posterior circulation can in theory produce such symptoms (slurred speech, weakness of the limbs, vision changes) and can’t be excluded, but it’s uncommon, TIAs usually happen in the anterior brain areas.
So taking that into account, as well as the fact that you have had recent imaging tests of your brain supplying blood vessels which resulted normal, I would say that the likelihood of the episode being a TIA is pretty low and I would wait for the scheduled visit tomorrow.
I remain at your disposal for other questions.